Focus on your daily activities and manage your daily routine - include max self study and rest according to your choice - dont make long plan but focus on daily plan
if you want to manage your time then you do it I also do that
first you see your all essential works that's important like sleeping and other work
then see how much hours you have then you 25 min a subject then take 5 min rest and after rest you take different subject and alternate the subject continuously and in the rest you do the only physical activities
try it may u manage ur time like me